<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Entry</title>
</head>
<body>
<input type="text" placeholder="请输入用户名:" id="username">
<button id="enter">进入聊天室</button>
<script src="js/entry.js"></script>
</body>
</html>